Friday, December 21, 2012

Image (click to enlarge): Chicago regional snowfall on December 20, 2012, from National Weather Service

The 0.2" of snow on Thursday (December 20) at Chicago ended the record longest streak without measurable snow. It was also the latest occurrence of a first measurable snow. Other streaks are continuing, including:

- 300th day without a high temperature below freezing (tied for 2nd longest)
- Latest first day of the season with high temperature below freezing (tied for 5th)
- 301st day without an inch or more of snow (8th longest)
- 299th day without an inch of snow on the ground (3rd longest)
- 344th day of the year without a high at or above freezing (tied for 8th)

The average temperature for 2012 to date is also well on the way to being the warmest on record at Chicago.

Here is the complete report from the National Weather Service:

THURSDAY`S STORM IN CHICAGO MANAGED TO MUSTER UP A COUPLE TENTHS
OF AN INCH OF ACCUMULATION WHICH OFFICIALLY ENDED CHICAGO`S SNOW
DROUGHT AND ESTABLISHED NEW RECORDS FOR LATEST FIRST MEASURABLE
SNOWFALL AND LONGEST STRETCH OF NO MEASURABLE SNOWFALL EVER IN
CHICAGO. HOWEVER...THURSDAY STORM HAS LEFT INTACT SOME OTHER
NOTABLE STREAKS FOR CHICAGO.
TEMPERATURES AT MIDNIGHT WERE STILL ABOVE FREEZING...SO THE STREAK
OF DAYS WITHOUT A SUB-FREEZING HIGH TEMPERATURE CONTINUES IN
CHICAGO. TODAY`S HIGH TEMPERATURE ABOVE FREEZING MAKES IT THE 300TH
CONSECUTIVE DAY WITHOUT A HIGH TEMPERATURE BELOW FREEZING...TYING
2004 FOR THE 2ND LONGEST STREAK. THE FORECAST SUGGESTS THIS STREAK
WILL CONTINUE THIS WEEKEND WHICH WOULD MAKE THIS YEAR THE LONGEST
STREAK WITHOUT A SUB-FREEZING HIGH TEMPERATURE SINCE 1878 WHEN
CHICAGO`S OFFICIAL OBSERVATION STATION WAS AT THE CHICAGO OPERA
HOUSE ON THE CORNER OF CLARK AND WASHINGTON IN THE LOOP. HERE ARE
THE TOP 5 LONGEST STREAKS OF CONSECUTIVE DAYS WITHOUT A HIGH
TEMPERATURE ABOVE FREEZING...
# DAYS END DATE
1) 308 12/15/1878
2) 300+ 12/21/2012+
300 12/12/2004
4) 290 12/09/2011
5) 289 12/24/1918
NOW THAT TODAYS HIGH TEMPERATURE IN CHICAGO WILL OFFICIALLY BE AT
LEAST 33F (THE READING AT MIDNIGHT)...THIS YEAR IN CHICAGO IS NOW
GUARANTEED TO MOVE INTO AT LEAST A TIE FOR 5TH PLACE FOR LATEST
FIRST DAY OF THE SEASON WITH A HIGH TEMPERATURE BELOW FREEZING.
HERE ARE THE TOP 5 LATEST DATES FOR FIRST DAY WITH HIGHS BELOW
FREEZING...
1) JAN 1 1924
2) DEC 28 1971
3) DEC 25 1918
4) DEC 24 2011
5) DEC 22 1998
??? ?? 2012
THE LAST TIME CHICAGO HAS HAD A CALENDAR DAY SNOWFALL OF ONE INCH
WAS BACK ON FEBRUARY 24TH...SO TODAY WILL BE THE 301ST CONSECUTIVE
DAY WITHOUT A 1 INCH SNOWFALL MAKING IT THE 8TH LONGEST STREAK
EVER IN CHICAGO. WITH SEVERAL MORE DAYS OF NO SNOW EXPECTED...THIS
YEAR IS BOUND TO MOVE UP IN THE RANKINGS. HERE ARE THE TOP TEN
LONGEST STREAKS WITHOUT A 1 INCH CALENDAR SNOWFALL...
# DAYS END DATE
1) 319 01/06/1940
2) 315 12/07/1958
3) 307 12/03/1921
4) 305 01/15/2002
5) 303 01/07/1944
6) 302 12/09/1988
302 11/16/1927
8) 301+ 12/21/2012+
9) 299 12/29/1990
10) 298 12/23/1918
CALENDAR SNOWFALL MAY BE SOMEWHAT DECEPTIVE SINCE THERE WERE LIKELY
EVENTS IN SOME OF THOSE YEARS WHERE A SNOWFALL MAY HAVE CROSSED
CALENDAR DAYS WITH A STORM TOTAL GREATER THAN 1 INCH...BUT EACH
CALENDAR DAY LESS THAN AN INCH RESPECTIVELY. TO REALLY PUT OUR SNOW
DROUGHT IN PERSPECTIVE...IT HAS BEEN 299 DAYS NOW SINCE CHICAGO HAS
OFFICIALLY HAD AN INCH OF SNOW ON THE GROUND. THIS IS THE 3RD
LONGEST STREAK OF CONSECUTIVE DAYS WITHOUT AN INCH OF SNOW ON THE
GROUND. HERE ARE THE TOP 5 LONGEST STREAKS...
# DAYS END DATE
1) 313 01/06/1940
2) 302 01/07/1944
3) 299+ 12/21/2012+
4) 296 12/12/1988
296 12/14/1946
ANOTHER INTERESTING STATISTIC IS THAT CHICAGO HAS HAD 344 DAYS WITH
HIGHS AT OR ABOVE FREEZING SO FAR THIS YEAR...WHICH ALREADY PLACES
US TIED FOR THE 8TH MOST NUMBER OF DAYS WITH HIGHS AT OR ABOVE
FREEZING IN A YEAR. WITH 10 MORE DAYS TO GO THIS YEAR AND MANY OF
THEM LIKELY ABOVE FREEZING 2012 IS LIKELY TO MOVE UP IN THE RANKING
HERE AS WELL. HERE ARE THE TOP 10 MOST NUMBER OF DAYS ABOVE FREEZING
IN A YEAR...
# DAYS YEAR
1) 355 1931
2) 353 2006
3) 348 1990
4) 346 1987
5) 345 1878
345 1992
345 1998
8) 344 1954
9) 343+ 2012 (THROUGH AND INCLUDING 12/21/2012)
10) 342 1882
342 1911
342 1921
FINALLY...THE AVERAGE TEMPERATURE IN CHICAGO SO FAR THIS YEAR HAS
BEEN 55.4 DEGREES WHICH PLACES 2012 WITHIN STRIKING DISTANCE OF
BREAKING THE RECORD FOR THE WARMEST YEAR EVER IN CHICAGO. THE
PREVIOUS RECORD WARMEST YEAR WAS 1921 WHEN THE AVERAGE TEMPERATURE
WAS 54.5F. IN ORDER TO HAVE THIS YEAR AVERAGE 54.6F AND BREAK THE
RECORD THE LAST 11 DAYS OF THE YEAR NEED TO HAVE AN AVERAGE
TEMPERATURE OF APPROXIMATELY 28.8F. IN ORDER FOR 2012 TO BE TIED FOR
THE WARMEST YEAR ON RECORD IN CHICAGO THE REMAINING 11 DAYS OF THE
YEAR WOULD NEED TO HAVE AN AVERAGE TEMPERATURE OF APPROXIMATELY
25.5F.

Tuesday, December 18, 2012

Images (click to enlarge): South Carolina high temperatures, June 29, 2012, from National Weather Service; Location of South Carolina all-time record high temperature, from South Carolina State Climatologist

The South Carolina State Climatologist announced today that the temperature of 113°F observed at Columbia on June 29, 2012 has been officially confirmed as a new all-time record high temperature for the state.

The temperature observation of 113 F recorded that day at the Columbia University of South Carolina National Weather Service (NWS) Cooperative site has been approved as the new state of South Carolina record maximum temperature. This value breaks the long-standing record of 111 F first set on September 4, 1925, at Blackville, at Calhoun Falls on September 8, 1925, and tied at Camden on June 27, 1954. South Carolina’s first state temperature record was recognized in 1887, 125 years ago.

Here are some other South Carolina high temperature reports for June 29, from the National Weather Service:

Monday, December 17, 2012

The National Climatic Data Center preliminary analysis for November 2012 shows that it was the 5th warmest November globally since records began in 1880. For meteorological autumn (September-November), it was the 2nd warmest, and for 2012 to date, it was the 8th warmest. Monthly global temperatures have been among their respective top 5 months for each of the 8 months since April. All of the 10 warmest Novembers have occurred in the last 12 years.

From the NCDC:

The average combined global land and ocean surface temperature for November 2012 was 0.67°C (1.21°F) above the 20th century average of 12.9°C (60.4°F). This is the fifth warmest November since records began in 1880. Including this November, the 10 warmest Novembers have occurred in the past 12 years.

The average combined global land and ocean surface temperature for September–November 2012 was 0.67°C (1.21°F) above the 20th century average of 14.0°C (57.1°F), marking the second warmest September–November on record, behind 2005.

The combined global land and ocean average surface temperature for January–November 2012 was the eighth warmest such period on record, at 0.59°C (1.06°F) above the 20th century average.

Images (click to enlarge): Global surface temperature anomalies (°C) for November 2012 and global surface temperature anomalies for November from 1880 through 2012, from NCDC